[参考文章](https://blog.long2ice.io/2023/03/%E7%A7%91%E5%AD%A6%E4%B8%8A%E7%BD%91%E4%B8%8Evpn%E5%8A%9E%E5%85%AC%E7%9A%84%E5%AE%8C%E7%BE%8E%E7%BB%93%E5%90%88/)